ReadyNAS NV+ - Received "Access to the disk on channel (??)"

Hello. I believe I need to replace a disk and would like to confirm that disk 4 is the likely suspect. The error message could not confirm the channel error.

I have four 2TB WD20EARS - 00MVWB0 drives in a ReadyNAS NV+ running Raidiator 4.1.10. They have been running ~1.5 years and were manufactured 2012-10-27. I know at the time I bought and installed them they were on the HCL, but no longer seem to be.

I received the error message: "Access to the disk on channel (??) is producing I/O errors. Although the array is still redundant, please replace this drive as soon as possible, as it is likely to fail soon.

The following is the SMART information results. I believe disk 4 is the issue due to the very high Multi-Zone Error Rate. 19477. However, if there are those on the forum that can help confirm, I would very much appreciate a second set of eyes on this. Too, any thoughts if I should be able to get a refund on this as I thought the warranty on these drives is 2 years?

If this drive is the one in error, I wanted to know if either the WD20EARX Caviar Green or the WD20EFRX WD Red would be the more recommended drive. I have access to a WD20EARX relatively quickly. I would likely have to order the WD RED and it would take a few days. Price is also a bit more expensive for the WD Red. However, I have read the that the WD RED may be a better long-term drive for the NAS. Recommendations from the forum?

Last thought/question. I bought and installed all four drives at the same time. Hence, concerns I should have regarding failures on the others?

Thanks.


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SMART Information for Disk 1

Model: WDC WD20EARS-00MVWB0
Serial: WD-WMAZA1629631
Firmware: 51.0AB51

SMART Attribute

Raw Read Error Rate 176
Spin Up Time 4600
Start Stop Count 594
Reallocated Sector Count 0
Seek Error Rate 0
Power On Hours 13654
Spin Retry Count 0
Calibration Retry Count 0
Power Cycle Count 11
Power-Off Retract Count 10
Load Cycle Count 806994
Temperature Celsius 33
Reallocated Event Count 0
Current Pending Sector 1333
Offline Uncorrectable 9
UDMA CRC Error Count 0
Multi Zone Error Rate 55

ATA Error Count 0

Extended Attribute

Hot-add events 0
Hot-remove events 0
Lp stat events 224
Power glitches 0
Hard disk resets 0
Retries 0
Repaired sectors 0


=============


SMART Information for Disk 2

Model: WDC WD20EARS-00MVWB0
Serial: WD-WMAZA1939188
Firmware: 51.0AB51

SMART Attribute

Raw Read Error Rate 0
Spin Up Time 4558
Start Stop Count 694
Reallocated Sector Count 0
Seek Error Rate 0
Power On Hours 13667
Spin Retry Count 0
Calibration Retry Count 0
Power Cycle Count 11
Power-Off Retract Count 10
Load Cycle Count 817692
Temperature Celsius 36
Reallocated Event Count 0
Current Pending Sector 0
Offline Uncorrectable 0
UDMA CRC Error Count 0
Multi Zone Error Rate 0

ATA Error Count 0

Extended Attribute

Hot-add events 0
Hot-remove events 0
Lp stat events 13
Power glitches 0
Hard disk resets 0
Retries 0
Repaired sectors 0


=============

SMART Information for Disk 3

Model: WDC WD20EARS-00MVWB0
Serial: WD-WCAZA5481471
Firmware: 51.0AB51

SMART Attribute

Raw Read Error Rate 0
Spin Up Time 4450
Start Stop Count 689
Reallocated Sector Count 0
Seek Error Rate 0
Power On Hours 13682
Spin Retry Count 0
Calibration Retry Count 0
Power Cycle Count 6
Power-Off Retract Count 5
Load Cycle Count 812734
Temperature Celsius 36
Reallocated Event Count 0
Current Pending Sector 0
Offline Uncorrectable 0
UDMA CRC Error Count 0
Multi Zone Error Rate 0

ATA Error Count 0

Extended Attribute

Hot-add events 0
Hot-remove events 0
Lp stat events 13
Power glitches 0
Hard disk resets 0
Retries 0
Repaired sectors 0


=============

SMART Information for Disk 4

Model WDC WD20EARS-00MVWB0
Serial WD-WMAZA1747379
Firmware 51.0AB51

SMART Attribute

Raw Read Error Rate 0
Spin Up Time 4500
Start Stop Count 695
Reallocated Sector Count 0
Seek Error Rate 0
Power On Hours 13691
Spin Retry Count 0
Calibration Retry Count 0
Power Cycle Count 11
Power-Off Retract Count 10
Load Cycle Count 831439
Temperature Celsius 35
Reallocated Event Count 0
Current Pending Sector 0
Offline Uncorrectable 0
UDMA CRC Error Count 1
Multi Zone Error Rate 19477

ATA Error Count 0

Extended Attribute

Hot-add events 0
Hot-remove events 0
Lp stat events 4
Power glitches 0
Hard disk resets 0
Retries 0
Repaired sectors 0